1 天前 · The ocean (also known as the sea or the world ocean) is a body of salt water that covers approximately 70.8% of the Earth and contains 97% of Earth's water.  The term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided. 
- 3.688 km (2 mi)
- 1,370,000,000 km³ (328,680,479 cu mi) (97.5% of Earth's water)
- 361,000,000 km² (139,382,879 sq mi) (71% of Earth's surface area)
- List of countries by length of coastline
1 天前 · Greenhouse gases trap some of the heat that results when sunlight heats the Earth's surface. Three important greenhouse gases are shown symbolically in this image: water vapor, carbon dioxide and methane. Radiative forcing (warming influence) of different contributors to climate change through 2019
4 天前 · Properties of water Water ( H2O) is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, which is nearly colorless apart from an inherent hint of blue. It is by far the most studied chemical compound  and is described as the "universal solvent "  and the "solvent of life". 
- Name and Symbol
- Formation and Migration
- Physical Characteristics
- Orbit and Rotation
In both the ancient Greek and Roman civilizations, Jupiter was named after the chief god of the divine pantheon: Zeus to the Greeks and Jupiter to the Romans. The International Astronomical Union formally adopted the name Jupiter for the planet in 1976, and has since named its newly discovered satellites for the god's lovers, favourites, and descen...
Jupiter is believed to be the oldest planet in the Solar System. Current models of Solar System formation suggest that Jupiter formed at or beyond the snow line: a distance from the early Sun where the temperature was sufficiently cold for volatiles such as water to condense into solids. The planet began as a solid core, which then accumulated its ...
Jupiter is a gas giant, being primarily composed of gas and liquid rather than solid matter. It is the largest planet in the Solar System, with a diameter of 142,984 km (88,846 mi) at its equator, giving it a volume 1,321 times that of the Earth. Its average density, 1.326 g/cm3, [d] is lower than those of the four terrestrial planets.
Jupiter is the only planet whose barycentre with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius. The average distance between Jupiter and the Sun is 778 million km (5.2 AU) and it completes an orbit every 11.86 years. This is approximately two-fifths the orbital period of Saturn, forming a near orbital resonance. ...
2 天前 · Renewable energy is energy from renewable resources that are naturally replenished on a human timescale. Renewable resources include sunlight, wind, the movement of water, and geothermal heat.   Although most renewable energy sources are sustainable, some are not.
1 天前 · Overview This table lists in its first column the initial digits of the country code shared by each country in each row, which is arranged in columns for the last digit. When three-digit codes share a common leading pair, the two-digit code is unassigned, being ambiguous (denoted by " ambig. "). Unassigned codes are denoted by a dash ( — ).
4 天前 · ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard  published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest.